Sounds like it's been around since 2004 and it's the same "desk" you get when you use the rebooking centers at the airports.

http://www.flyertalk.com/forum/ameri...-desk-oso.html

My instinct is to prioritize:

AAngel
Platinum (EXP when eligible) line
OSO

I'm sure someone else with actual experience will educate me though.